Electrical change-over apparatus



Oct. 23 1923. 1,473,363

H. RIEGGER V ELECTRICAL CHANGE OVER APPARATUS Filed Aug. 24 1922 Rec/Ev! A/C DE V/C 5 RENEW/Vow d 22 DEV/C E Patented fist. 23, l ill'ih HANS RIEGGER, OE BERLIN-PANKOW', GERMANY. ASSIGNOR 1'0 SIEMENS HALSKE AKTIENGESELLSCEAFT, OF SIEMENSSTADT, NEAR BERLIM, GERMANY, A CORPtDBA- TION or GERMANY.

ELECTRICAL CHANGE-OVER AIPPARATUfi.

Application filed August 2 4, 1922. Serial No. 584:,084l.

To all whom. it may concern:

Be it known that I. HANs Russel-1n, a citizen of the German Empire, residing at Berlin-Pankow, Germany, hav invented certain new and useful Improvements in or Relating to Electrical Change-ver Apparatus, of which the following is a specification. a

My invention relates to electrical changeover apparatus for alternating currents and is Preferably used for submarine signalling purposes.

lVhen receiving sounds under water it is frequently "iportant to determine which one of VZIIi-ireceii ing devices is excited the stronges' y the incoming sound waves, as a concln: as to the point of origin of the sound s can be drawn from this determination. in order that such determinat-ion may i ssible even in the case of very \VQtll lllC0.. energy it is necessary to listen toethe sounds as received at the different receiving devices in quick succesv s'mn with one and the same telephone receiver. For this purpose changeover switches, slip rings'or the like have hitherto been employed hu-tsuch devices are unsatisfactory, as the transitory variatioi'is of resistance which arise in them usually of themselves set up loud noises in the telephone or at least interfere greatly with the sounds being received.

The object of my invention is to effect the necessary change-over operation Without the employment of any physical contacting devices such as slip rings. changeover switches or the like in the circuit.

According to my inventions rotatable system is provided which carries two electrically connected transformer coils, the axis of which are disaligned relatively to each other. The axis of one of th so coils lies in the axis of rotation of the tern and this coil is permanently in mutual inductive re lationship with a third coil. The other of the two coils carried by the rotatable system describes a circle when the system is rotated passing succ into mutual inductive relationship 4 a, series of additional transformer coils.

In order that the said invention may be clearly understood and readily carried into effect the same will now he described more fully with reference to the accompanying drawings in which: Figure 1 is a side elevation of one constructional form of the invention, Figure 2 is a front elevation of another constructional form.

Referring to Fig. 1 two receiving devices for submarine signals are desidgnated 1 and 2 one of which may be place on the port side and the other on the starboard side of a ship. The currents produced in the receiver 1 flow through the stationary coil 3, and those produced in the receiver 2 through the stationary coil 4. The rotatable system consists of a shaft 5 on which a coil 6 and a carrier arm 7 are mounted. 0n this arm is mounted a coil. 8, which is electrically connected with the coil 6 by means of the conductors 11. The coil 6, which rotates with the shaft 5 about its own axis, is in permanent mutual inductive relationship with the coil 9, which is in electrical connection with the earpiece 10. In the position of the apparatus indicated in full lines the alternating currents produced in the receiver 1 are reproduced in the earpiece 10 by inductive action between coils 3 and 8, and 6 and 9 respectively. If the shaft 5 be rotated through 180 the coil 8 is brought into the position indicatedin dotted lines, that is to say into mutual inductive relationship with the coil 4. In this case the currents produced in the re ceiver 2 are reproduced in the earpiece 10. The changeover is thus effected Without any of the circuits being broken and without the employment of any contact spring, rnereur v or other contacts.

In addition to the coils 3 and i other coils may be provided at the same distance from the shaft 5. with which coils the coil 8 may he brought into mutual inductive relation by uitable. angular displacement of the rotatable system.

An apparatus of this kind is shown in Fig. 2. There are three stationary coils with windings 21, 22. 23 surrounding cores El, 25, respectively. These coils and cores are as will be seen from the drawing of elongated cross-section with the object of allowing the shaft 5 to rotate uninten rnptedly. During one portion of a revolution the coil 8 which is fixed to the shaft 5 by the arm 7 in the same Way as shown by til) hit

- Fig, 1, will be in mutual inductive relati0n- I 27, 28, 29 respectively. The incoming sound waves will be heard successively in the telecurrents, comprising in combination phone 10.

Though I have described my invention as used for submarine signalling purposes it is obviously not limited to this Way of being used but wiil prove useful in numerous other connections where the employment of switches, slip rings or liquid contacts would involve disadvantages.

I claim:

1. Change-over apparatus for alternating a rotatable art, a transformer coil carried by the rotatailc part the 'axisof the coil being in transformer coils pla alignment with the axis of the rotatable part, a second transformer coil carried by the rotatable part and electrically connected to the other coil the axes of the coils being disali 'ned relatively to each other, a third transformer coil arranged stationary and placed inmutual Withthe first .coil, and other stationary 'ced along the path of the second transformer coil when rotated.

2. In change-over apparatus for alternating currents the combination with the elements claimed in claim 1 of an indicatin device electrically connected to the third transformer coil and of submarine receivers electrically connected to the transformer coils.

In testimony whereof I a-fiix my signature.

- HANS RIEGGER.

other stationary inductive relationship 

